i.MX Processorsのトピックscreen goes black while mouse move

screen goes black while mouse move

linzhang — Thu, 02 Jun 2016 09:29:15 GMT

a problem of display.

I have done following steps to overlay fb1 on fb0:

1. set the geometry of fb1 to fb0's geometry(ioctl(FBIOPUT_VSCREENINFO)).

2. call ioctl(MXCFB_SET_LOC_ALPHA) on fb1:

l_alpha.enable = 1;

l_alpha.alpha_in_pixel = 0;

3. output images to fb1's non-transparent area.

after those, I found that the screen goes black while moving mouse.

if moving stopped, the screen come back, images and controls will display.

how can I fix this bug?

igorpadykov — Fri, 03 Jun 2016 02:08:03 GMT

Hi lin

seems there are errors in drivers and one can try to debug them using

AN4553 Using Open Source Debugging Tools for Linux on i.MX Processors

cache.nxp.com/files/32bit/doc/app_note/AN4553.pdf

Best regards

igor

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linzhang — Fri, 03 Jun 2016 08:54:35 GMT

and ocassionally, the following erros will be printed repeatedly while moving mouse:

mxc_sdc_fb fb.31: timeout when waiting for flip irq

igorpadykov — Fri, 03 Jun 2016 14:59:19 GMT

for this error please look at

linzhang — Mon, 06 Jun 2016 02:58:00 GMT

I have changed the timeout value from HZ/2 to 4*HZ, but the error still exists。

ret = wait_for_completion_timeout(&mxc_fbi->flip_complete, 4*HZ /*HZ/2*/);